[TIMOB-9494] iOS:UI.iPhone.NavigationGroup - Opening window added in the Navgroup shows an intermittent behavior while allocating and de-allocating the memory.

var _window = Ti.UI.createWindow({
	backgroundColor : 'blue'
})
// Global namespace
			var App = {};
			// used to simulate global object
			var Global = {};
			
			// Initial Window
			App.homeWindow = Ti.UI.createWindow({
				title: 'Home Window'
			});
			
			// NavGroup
			App.nav = Ti.UI.iPhone.createNavigationGroup({
			   	window: App.homeWindow
			});
			
			// Module loader / helper
			App.loadPage = function(_name, _params) {
				// Private
				var win = Ti.UI.createWindow({ backgroundColor: '#eee' }),
					scrollable = Ti.UI.createScrollableView(),
					close = null;
				
				// simluate exports object	
				Global.exports = {};
				
				// Public
				Global.exports.load = function(_app, _params) {
					win.title = _params.title;
					
					close = Ti.UI.createButton({
						title: 'close',
						width: '50%',
						height: 75
					});
					
					// Closing the window means it will never get released
					// NOTE: It will get released if you hit the auto generated back button.
					close.addEventListener('click', function() {
						_app.nav.close(win);
						// None of these free up memory:
						win = null;
						scrollable = null;
						Global.exports = null;
					});
					
					win.add(scrollable);
					win.add(close);
					
					_app.nav.open(win);
				};
				
				Global.exports.load(App, _params);
			};
			
			/**
			 * Initial page
			 */
			var data = [
				{ title: 'One' },
				{ title: 'Two' },
				{ title: 'Three' },
			];
			
			var table = Ti.UI.createTableView({
				data: data
			});
			
			table.addEventListener('click', function(e) {
				App.loadPage('someModule', {
					title: e.row.title
				});
			});
			
			App.homeWindow.add(table);
			
			_window.add(App.nav);
			_window.open();